Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[linux-2.6] / arch / sparc64 / kernel / signal.c
1 /*
2  *  arch/sparc64/kernel/signal.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
8  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
9  */
10
11 #ifdef CONFIG_COMPAT
12 #include <linux/compat.h>       /* for compat_old_sigset_t */
13 #endif
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/signal.h>
17 #include <linux/errno.h>
18 #include <linux/wait.h>
19 #include <linux/ptrace.h>
20 #include <linux/tracehook.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/binfmts.h>
25 #include <linux/bitops.h>
26 #include <linux/tracehook.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/pgtable.h>
31 #include <asm/fpumacro.h>
32 #include <asm/uctx.h>
33 #include <asm/siginfo.h>
34 #include <asm/visasm.h>
35
36 #include "entry.h"
37 #include "systbls.h"
38
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41 /* {set, get}context() needed for 64-bit SparcLinux userland. */
42 asmlinkage void sparc64_set_context(struct pt_regs *regs)
43 {
44         struct ucontext __user *ucp = (struct ucontext __user *)
45                 regs->u_regs[UREG_I0];
46         mc_gregset_t __user *grp;
47         unsigned long pc, npc, tstate;
48         unsigned long fp, i7;
49         unsigned char fenab;
50         int err;
51
52         flush_user_windows();
53         if (get_thread_wsaved()                                 ||
54             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
55             (!__access_ok(ucp, sizeof(*ucp))))
56                 goto do_sigsegv;
57         grp  = &ucp->uc_mcontext.mc_gregs;
58         err  = __get_user(pc, &((*grp)[MC_PC]));
59         err |= __get_user(npc, &((*grp)[MC_NPC]));
60         if (err || ((pc | npc) & 3))
61                 goto do_sigsegv;
62         if (regs->u_regs[UREG_I1]) {
63                 sigset_t set;
64
65                 if (_NSIG_WORDS == 1) {
66                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67                                 goto do_sigsegv;
68                 } else {
69                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70                                 goto do_sigsegv;
71                 }
72                 sigdelsetmask(&set, ~_BLOCKABLE);
73                 spin_lock_irq(&current->sighand->siglock);
74                 current->blocked = set;
75                 recalc_sigpending();
76                 spin_unlock_irq(&current->sighand->siglock);
77         }
78         if (test_thread_flag(TIF_32BIT)) {
79                 pc &= 0xffffffff;
80                 npc &= 0xffffffff;
81         }
82         regs->tpc = pc;
83         regs->tnpc = npc;
84         err |= __get_user(regs->y, &((*grp)[MC_Y]));
85         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
86         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
87         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
88         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
89         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
90         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
91         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
92         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
93         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
94         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
95         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
96         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
97         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
98         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
99         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
100         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
101         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
102         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
103
104         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
105         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
106         err |= __put_user(fp,
107               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
108         err |= __put_user(i7,
109               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
110
111         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
112         if (fenab) {
113                 unsigned long *fpregs = current_thread_info()->fpregs;
114                 unsigned long fprs;
115                 
116                 fprs_write(0);
117                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
118                 if (fprs & FPRS_DL)
119                         err |= copy_from_user(fpregs,
120                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
121                                               (sizeof(unsigned int) * 32));
122                 if (fprs & FPRS_DU)
123                         err |= copy_from_user(fpregs+16,
124                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
125                          (sizeof(unsigned int) * 32));
126                 err |= __get_user(current_thread_info()->xfsr[0],
127                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
128                 err |= __get_user(current_thread_info()->gsr[0],
129                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
130                 regs->tstate &= ~TSTATE_PEF;
131         }
132         if (err)
133                 goto do_sigsegv;
134
135         return;
136 do_sigsegv:
137         force_sig(SIGSEGV, current);
138 }
139
140 asmlinkage void sparc64_get_context(struct pt_regs *regs)
141 {
142         struct ucontext __user *ucp = (struct ucontext __user *)
143                 regs->u_regs[UREG_I0];
144         mc_gregset_t __user *grp;
145         mcontext_t __user *mcp;
146         unsigned long fp, i7;
147         unsigned char fenab;
148         int err;
149
150         synchronize_user_stack();
151         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
152                 goto do_sigsegv;
153
154 #if 1
155         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
156 #else
157         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
158 #endif
159                 
160         mcp = &ucp->uc_mcontext;
161         grp = &mcp->mc_gregs;
162
163         /* Skip over the trap instruction, first. */
164         if (test_thread_flag(TIF_32BIT)) {
165                 regs->tpc   = (regs->tnpc & 0xffffffff);
166                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
167         } else {
168                 regs->tpc   = regs->tnpc;
169                 regs->tnpc += 4;
170         }
171         err = 0;
172         if (_NSIG_WORDS == 1)
173                 err |= __put_user(current->blocked.sig[0],
174                                   (unsigned long __user *)&ucp->uc_sigmask);
175         else
176                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
177                                       sizeof(sigset_t));
178
179         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
180         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
181         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
182         err |= __put_user(regs->y, &((*grp)[MC_Y]));
183         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
184         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
185         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
186         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
187         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
188         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
189         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
190         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
191         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
192         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
193         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
194         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
195         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
196         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
197         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
198
199         err |= __get_user(fp,
200                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
201         err |= __get_user(i7,
202                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
203         err |= __put_user(fp, &(mcp->mc_fp));
204         err |= __put_user(i7, &(mcp->mc_i7));
205
206         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
207         if (fenab) {
208                 unsigned long *fpregs = current_thread_info()->fpregs;
209                 unsigned long fprs;
210                 
211                 fprs = current_thread_info()->fpsaved[0];
212                 if (fprs & FPRS_DL)
213                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
214                                             (sizeof(unsigned int) * 32));
215                 if (fprs & FPRS_DU)
216                         err |= copy_to_user(
217                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
218                           (sizeof(unsigned int) * 32));
219                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
220                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
221                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
222         }
223         if (err)
224                 goto do_sigsegv;
225
226         return;
227 do_sigsegv:
228         force_sig(SIGSEGV, current);
229 }
230
231 struct rt_signal_frame {
232         struct sparc_stackf     ss;
233         siginfo_t               info;
234         struct pt_regs          regs;
235         __siginfo_fpu_t __user  *fpu_save;
236         stack_t                 stack;
237         sigset_t                mask;
238         __siginfo_fpu_t         fpu_state;
239 };
240
241 static long _sigpause_common(old_sigset_t set)
242 {
243         set &= _BLOCKABLE;
244         spin_lock_irq(&current->sighand->siglock);
245         current->saved_sigmask = current->blocked;
246         siginitset(&current->blocked, set);
247         recalc_sigpending();
248         spin_unlock_irq(&current->sighand->siglock);
249
250         current->state = TASK_INTERRUPTIBLE;
251         schedule();
252
253         set_restore_sigmask();
254
255         return -ERESTARTNOHAND;
256 }
257
258 asmlinkage long sys_sigpause(unsigned int set)
259 {
260         return _sigpause_common(set);
261 }
262
263 asmlinkage long sys_sigsuspend(old_sigset_t set)
264 {
265         return _sigpause_common(set);
266 }
267
268 static inline int
269 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
270 {
271         unsigned long *fpregs = current_thread_info()->fpregs;
272         unsigned long fprs;
273         int err;
274
275         err = __get_user(fprs, &fpu->si_fprs);
276         fprs_write(0);
277         regs->tstate &= ~TSTATE_PEF;
278         if (fprs & FPRS_DL)
279                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
280                                (sizeof(unsigned int) * 32));
281         if (fprs & FPRS_DU)
282                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
283                                (sizeof(unsigned int) * 32));
284         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
285         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
286         current_thread_info()->fpsaved[0] |= fprs;
287         return err;
288 }
289
290 void do_rt_sigreturn(struct pt_regs *regs)
291 {
292         struct rt_signal_frame __user *sf;
293         unsigned long tpc, tnpc, tstate;
294         __siginfo_fpu_t __user *fpu_save;
295         sigset_t set;
296         int err;
297
298         /* Always make any pending restarted system calls return -EINTR */
299         current_thread_info()->restart_block.fn = do_no_restart_syscall;
300
301         synchronize_user_stack ();
302         sf = (struct rt_signal_frame __user *)
303                 (regs->u_regs [UREG_FP] + STACK_BIAS);
304
305         /* 1. Make sure we are not getting garbage from the user */
306         if (((unsigned long) sf) & 3)
307                 goto segv;
308
309         err = get_user(tpc, &sf->regs.tpc);
310         err |= __get_user(tnpc, &sf->regs.tnpc);
311         if (test_thread_flag(TIF_32BIT)) {
312                 tpc &= 0xffffffff;
313                 tnpc &= 0xffffffff;
314         }
315         err |= ((tpc | tnpc) & 3);
316
317         /* 2. Restore the state */
318         err |= __get_user(regs->y, &sf->regs.y);
319         err |= __get_user(tstate, &sf->regs.tstate);
320         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
321
322         /* User can only change condition codes and %asi in %tstate. */
323         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
324         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
325
326         err |= __get_user(fpu_save, &sf->fpu_save);
327         if (fpu_save)
328                 err |= restore_fpu_state(regs, &sf->fpu_state);
329
330         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
331         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
332
333         if (err)
334                 goto segv;
335
336         regs->tpc = tpc;
337         regs->tnpc = tnpc;
338
339         /* Prevent syscall restart.  */
340         pt_regs_clear_syscall(regs);
341
342         sigdelsetmask(&set, ~_BLOCKABLE);
343         spin_lock_irq(&current->sighand->siglock);
344         current->blocked = set;
345         recalc_sigpending();
346         spin_unlock_irq(&current->sighand->siglock);
347         return;
348 segv:
349         force_sig(SIGSEGV, current);
350 }
351
352 /* Checks if the fp is valid */
353 static int invalid_frame_pointer(void __user *fp, int fplen)
354 {
355         if (((unsigned long) fp) & 7)
356                 return 1;
357         return 0;
358 }
359
360 static inline int
361 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
362 {
363         unsigned long *fpregs = current_thread_info()->fpregs;
364         unsigned long fprs;
365         int err = 0;
366         
367         fprs = current_thread_info()->fpsaved[0];
368         if (fprs & FPRS_DL)
369                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
370                                     (sizeof(unsigned int) * 32));
371         if (fprs & FPRS_DU)
372                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
373                                     (sizeof(unsigned int) * 32));
374         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
375         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
376         err |= __put_user(fprs, &fpu->si_fprs);
377
378         return err;
379 }
380
381 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
382 {
383         unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
384
385         /*
386          * If we are on the alternate signal stack and would overflow it, don't.
387          * Return an always-bogus address instead so we will die with SIGSEGV.
388          */
389         if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
390                 return (void __user *) -1L;
391
392         /* This is the X/Open sanctioned signal stack switching.  */
393         if (ka->sa.sa_flags & SA_ONSTACK) {
394                 if (sas_ss_flags(sp) == 0)
395                         sp = current->sas_ss_sp + current->sas_ss_size;
396         }
397
398         /* Always align the stack frame.  This handles two cases.  First,
399          * sigaltstack need not be mindful of platform specific stack
400          * alignment.  Second, if we took this signal because the stack
401          * is not aligned properly, we'd like to take the signal cleanly
402          * and report that.
403          */
404         sp &= ~7UL;
405
406         return (void __user *)(sp - framesize);
407 }
408
409 static inline void
410 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
411                int signo, sigset_t *oldset, siginfo_t *info)
412 {
413         struct rt_signal_frame __user *sf;
414         int sigframe_size, err;
415
416         /* 1. Make sure everything is clean */
417         synchronize_user_stack();
418         save_and_clear_fpu();
419         
420         sigframe_size = sizeof(struct rt_signal_frame);
421         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
422                 sigframe_size -= sizeof(__siginfo_fpu_t);
423
424         sf = (struct rt_signal_frame __user *)
425                 get_sigframe(ka, regs, sigframe_size);
426         
427         if (invalid_frame_pointer (sf, sigframe_size))
428                 goto sigill;
429
430         if (get_thread_wsaved() != 0)
431                 goto sigill;
432
433         /* 2. Save the current process state */
434         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
435
436         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
437                 err |= save_fpu_state(regs, &sf->fpu_state);
438                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
439         } else {
440                 err |= __put_user(0, &sf->fpu_save);
441         }
442         
443         /* Setup sigaltstack */
444         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
445         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
446         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
447
448         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
449
450         err |= copy_in_user((u64 __user *)sf,
451                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
452                             sizeof(struct reg_window));
453
454         if (info)
455                 err |= copy_siginfo_to_user(&sf->info, info);
456         else {
457                 err |= __put_user(signo, &sf->info.si_signo);
458                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
459         }
460         if (err)
461                 goto sigsegv;
462         
463         /* 3. signal handler back-trampoline and parameters */
464         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
465         regs->u_regs[UREG_I0] = signo;
466         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
467
468         /* The sigcontext is passed in this way because of how it
469          * is defined in GLIBC's /usr/include/bits/sigcontext.h
470          * for sparc64.  It includes the 128 bytes of siginfo_t.
471          */
472         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
473
474         /* 5. signal handler */
475         regs->tpc = (unsigned long) ka->sa.sa_handler;
476         regs->tnpc = (regs->tpc + 4);
477         if (test_thread_flag(TIF_32BIT)) {
478                 regs->tpc &= 0xffffffff;
479                 regs->tnpc &= 0xffffffff;
480         }
481         /* 4. return to kernel instructions */
482         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
483         return;
484
485 sigill:
486         do_exit(SIGILL);
487 sigsegv:
488         force_sigsegv(signo, current);
489 }
490
491 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
492                                  siginfo_t *info,
493                                  sigset_t *oldset, struct pt_regs *regs)
494 {
495         setup_rt_frame(ka, regs, signr, oldset,
496                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
497         spin_lock_irq(&current->sighand->siglock);
498         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
499         if (!(ka->sa.sa_flags & SA_NOMASK))
500                 sigaddset(&current->blocked,signr);
501         recalc_sigpending();
502         spin_unlock_irq(&current->sighand->siglock);
503 }
504
505 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
506                                    struct sigaction *sa)
507 {
508         switch (regs->u_regs[UREG_I0]) {
509         case ERESTART_RESTARTBLOCK:
510         case ERESTARTNOHAND:
511         no_system_call_restart:
512                 regs->u_regs[UREG_I0] = EINTR;
513                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
514                 break;
515         case ERESTARTSYS:
516                 if (!(sa->sa_flags & SA_RESTART))
517                         goto no_system_call_restart;
518                 /* fallthrough */
519         case ERESTARTNOINTR:
520                 regs->u_regs[UREG_I0] = orig_i0;
521                 regs->tpc -= 4;
522                 regs->tnpc -= 4;
523         }
524 }
525
526 /* Note that 'init' is a special process: it doesn't get signals it doesn't
527  * want to handle. Thus you cannot kill init even with a SIGKILL even by
528  * mistake.
529  */
530 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
531 {
532         struct k_sigaction ka;
533         int restart_syscall;
534         sigset_t *oldset;
535         siginfo_t info;
536         int signr;
537         
538         if (pt_regs_is_syscall(regs) &&
539             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
540                 restart_syscall = 1;
541         } else
542                 restart_syscall = 0;
543
544         if (current_thread_info()->status & TS_RESTORE_SIGMASK)
545                 oldset = &current->saved_sigmask;
546         else
547                 oldset = &current->blocked;
548
549 #ifdef CONFIG_COMPAT
550         if (test_thread_flag(TIF_32BIT)) {
551                 extern void do_signal32(sigset_t *, struct pt_regs *,
552                                         int restart_syscall,
553                                         unsigned long orig_i0);
554                 do_signal32(oldset, regs, restart_syscall, orig_i0);
555                 return;
556         }
557 #endif  
558
559         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
560
561         /* If the debugger messes with the program counter, it clears
562          * the software "in syscall" bit, directing us to not perform
563          * a syscall restart.
564          */
565         if (restart_syscall && !pt_regs_is_syscall(regs))
566                 restart_syscall = 0;
567
568         if (signr > 0) {
569                 if (restart_syscall)
570                         syscall_restart(orig_i0, regs, &ka.sa);
571                 handle_signal(signr, &ka, &info, oldset, regs);
572
573                 /* A signal was successfully delivered; the saved
574                  * sigmask will have been stored in the signal frame,
575                  * and will be restored by sigreturn, so we can simply
576                  * clear the TS_RESTORE_SIGMASK flag.
577                  */
578                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
579
580                 tracehook_signal_handler(signr, &info, &ka, regs, 0);
581                 return;
582         }
583         if (restart_syscall &&
584             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
585              regs->u_regs[UREG_I0] == ERESTARTSYS ||
586              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
587                 /* replay the system call when we are done */
588                 regs->u_regs[UREG_I0] = orig_i0;
589                 regs->tpc -= 4;
590                 regs->tnpc -= 4;
591         }
592         if (restart_syscall &&
593             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
594                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
595                 regs->tpc -= 4;
596                 regs->tnpc -= 4;
597         }
598
599         /* If there's no signal to deliver, we just put the saved sigmask
600          * back
601          */
602         if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
603                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
604                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
605         }
606 }
607
608 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
609 {
610         if (thread_info_flags & _TIF_SIGPENDING)
611                 do_signal(regs, orig_i0);
612         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
613                 clear_thread_flag(TIF_NOTIFY_RESUME);
614                 tracehook_notify_resume(regs);
615         }
616 }